Which component prevents fuel from flowing from forward to aft?

• A. Baffles
• B. Flapper valves
• C. Transfer pumps
• D. Boost pumps

Answer: (B)

The flapper valves are designed to prevent fuel from flowing from the forward tank to the aft tank in the TH-73 helicopter. These valves operate on a simple mechanical principle, utilizing a hinged flap that opens in one direction to allow fuel flow during specific conditions but closes to restrict reverse flow. This design is crucial for maintaining the helicopter's center of gravity and ensuring that fuel is stored in the designated areas, which can impact the overall performance and stability of the aircraft during flight.

The other components listed have different functions. Baffles serve to manage the movement of fuel within a tank and can help in reducing fuel slosh but do not actively prevent forward flow. Transfer pumps are responsible for moving fuel between different tanks but do not control the direction of flow in the same way as flapper valves. Boost pumps assist in delivering fuel from the tank to the engines, ensuring adequate pressure and flow but do not play a role in preventing fuel from moving between sections of the tank.